White Balance Adjustment - Emerson LC320EM9 Service Manual

The following adjustment normally are not attempted in
the field. Only when replacing the LCD Panel then adjust
as a preparation.

3. White Balance Adjustment

Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Test Point Adj. Point
[CH o/p] [VIDEO1]
Screen
buttons
M. EQ.
Pattern Generator,
Color analyzer
Figure
It carries out in a darkroom.
Perpendicularity
L = 3 cm
INPUT: WHITE 70%, 25%
1. Operate the unit for more than 20 minutes.
2. Input the White Raster(70%=70IRE, 25%=25IRE).
INPUT SIGNAL
25%=25IRE 70%=70IRE
3. Set the color analyzer to the CHROMA mode and
bring the optical receptor to the center on the
LCD-Panel surface after zero point calibration as
shown above.
Note: The optical receptor must be set
perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [VOL. n] button on
the service remote control unit and select "C/D"
mode.
Mode Input
White Raster
(APL 70%)
C/D
or
(APL 25%)
Spec.
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Color Analyzer
5. [CUTOFF]
Press [3] button to select "COB" for Blue Cutoff
adjustment. Press [1] button to select "COR" for
Red Cutoff adjustment.
[DRIVE]
Press [6] button to select "DB" for Blue Drive
adjustment. Press [4] button to select "DR" for Red
Drive adjustment.
6. In each color mode, press [CH o / p] buttons to
adjust the values of color.
7. Adjust Cutoff and Drive so that the color
temperature becomes 12000°K (x= 0.272 / y=
0.278 ±0.005).
5-3 A8AF0EA